LTC1343 Datasheet, PDF (1/28 Pages) Linear Technology – Software-Selectable Multiprotocol Transceiver

FEATURES
s _{Software-Selectable Transceiver Supports:}
RS232, RS449, EIA-530, EIA-530-A, V.35, V.36,
X.21
s _{NET1 and NET2 Compliant}
s _{Software-Selectable Cable Termination Using}
the LTC1344
s _{4-Driver/4-Receiver Configuration Provides a}
Complete 2-Chip DTE or DCE Port
s _{Operates from Single 5V Supply}
s _{Internal Echoed Clock and Loop-Back Logic}
U
APPLICATIO S
s _{Data Networking}
s _{CSU and DSU}
s _{Data Routers}
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1343
Software-Selectable
Multiprotocol Transceiver
DESCRIPTIO
The LTC^®1343 is a 4-driver/4-receiver multiprotocol trans-
ceiver that operates from a single 5V supply. Two LTC1343s
form the core of a complete software-selectable DTE or DCE
interface port that supports the RS232, RS449, EIA-530,
EIA-530-A, V.35, V.36 or X.21 protocols. Cable termination
may be implemented using the LTC1344 software-selectable
cable termination chip or by using existing discrete designs.
The LTC1343 runs from a single 5V supply using an internal
charge pump that requires only five space saving surface mount
capacitors. The mode pins are latched internally to allow sharing
of the select lines between multiple interface ports.
Software-selectable echoed clock and loop-back modes help
eliminate the need for external glue logic between the serial
controller and line transceiver. The part features a flow-
through architecture to simplify EMI shielding and is available
in the 44-lead SSOP surface mount package.
TYPICAL APPLICATIO
CTS DSR DCD
DTE Multiprotocol Serial Interface with DB-25 Connector
DTR RTS RL
TM RXD RXC TXC
SCTE TXD LL
LTC1343
R4 R3 R2 R1
D4 D3 D2 D1
LTC1343
R4 R3 R2 R1
D4 D3 D2 D1
LTC1344
13 5 22 6 10 8
23 20 19 4 21 1 7 25 16 3 9 17 12 15
11 24 14 2 18
DB-25 CONNECTOR
1343 TA01
1